DRV102

8

SBVS009A

www.ti.com

BASIC OPERATION

The DRV102 is a high-side, bipolar power switch employ-

ing a pulse-width modulated (PWM) output for driving

electromechanical and thermal devices. Its design is opti-

mized for two types of applications: a two-state driver

(open/close) for loads such as solenoids and actuators, and

a linear driver for valves, positioners, heaters, and lamps. Its

wide supply range, adjustable delay to PWM mode, and

adjustable duty cycle make it suitable for a wide range of

applications. Figure 1 shows the basic circuit connections to

operate the DRV102. A 0.1

µF bypass capacitor is shown

connected to the power supply pin.

The Input (pin 1) is compatible with standard TTL levels.

Input voltages between +2.2V and +5.5V turn the device

output on, while pulling the pin low (0V to +1.2V), shuts the

DRV102 output off. Input current is typically 80

µA.

Delay Adjust (pin 2) and Duty Cycle Adjust (pin 3) allow

external adjustment of the PWM output signal. The Delay

Adjust pin can be left floating for minimum delay to PWM

mode (typically 15

µs) or a capacitor can be used to set the

delay time. Duty cycle of the PWM output can be controlled

by a resistor, analog voltage, or D/A converter. Figure 1b

provides an example timing diagram with the Delay Adjust

FIGURE 1. Basic Circuit Connections and Timing Diagram.

pin connected to 0.1

µF and duty cycle set for 25%. See the

“Delay Adjust” and “Duty Cycle Adjust” text for equations

and further explanation.

Ground (pin 4) is electrically connected to the package tab.

This pin must be connected to system ground for the

DRV102 to function. This serves as the DRV102 reference

ground.

The load (solenoid, valve, etc.) is connected between the

output (pin 6) and ground. For an inductive load, an external

The diode serves to maintain the hold force during PWM

operation. Depending on the application, the flyback diode

should be placed near the DRV102 or close to the solenoid

(see “Flyback Diode” text). The device’s internal clamp

diode, connected between the output and ground, should not

be used to carry load current. When driving inductive loads,

(see “Series Diode” text).

The Flag (pin 7) provides fault status for under-current,

over-current, and thermal shutdown conditions. This pin is

active low with pin voltage typically +0.2V during a fault

condition. A small value capacitor may be needed between

Flag and ground for noisy applications.

Delay

Adjust

Input

(TTL-Compatible)

On

Off

Thermal Shutdown

Over/Under Current

Flag

DRV102

Load

Duty

Cycle

Adjust

24kHz

Oscillator

PWM

23

1

7

6

Out

5

4

Gnd

(Gnd electrically

connected to tab)

Delay

OUTPUT

0

INPUT

+2.2V to +5.5V

0V to +1.2V

Duty Cycle =

= 25%

1a). Basic Circuit Connections

1b). Simplified Timing Diagram

(1)

92ms

• • •

• • •

Initial dc Output

(set by value

PWM Mode

(resistor or voltage

controlled)

NOTE: (1) External flyback diode required for inductive loads to conduct load current during the off cycle.

Flyback diode shown near DRV102. For some applications with remotely located load, it may be desirable

to place the diode near the solenoid—see “Flyback Diode” text. Motorola MSRS1100T3 (1A, 100V) or

MBRS360T3 (3A, 60V).

0.1

µF

(+8V to +60V)